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computer keeps shutting down need some advice please

Hi people needs some help and advice please, having problem with desktop shutting down. Started a week or so ago first thing that happened when it first shut down graphic’s card wouldn’t kick in so took graphics card out and used on board graphics which ran ok but as soon as I did anything that was cpu intensive it would shut down after a 10 minutes thought it might be over heating so took fan and heatsink off and replaced with new heatsink and fan with variable speed control ramped fan up to full speed but comp still shutting down using Everest home edition to monitor cpu and hard drive sensors at the moment they are reading cpu 33 degrees c 91 degrees f harddrve 42c 108f my comp specs are:
Windows xp service pack3
CPU Type Dual Core Intel Pentium D 805, 2666 MHz (20 x 133)
Motherboard Chipset ATI Radeon Xpress 200
Any advice would be greatly appreciated
Thanks
ps sometimes when it shuts down it restarts its self then other times it will shut down but the power light stops on and only way i can restart it is if i disconnect the power cable from comp and leave for a few seconds to drain power then plug back in and press power button and it will restart.

I had similar symptoms a couple of years ago with a fairly new Hewlett Packard (with two separate hard discs). The first time it gave any sign of a problem, it also wiped all the data from both HDDs.

The symptoms settled down to irregular shutting down and instant re-starting, at random intervals, not always when the machine got hot. Sometimes it would happen after half an hour, and on other occasions it would work fine for six or eight hours. We tried various software and hardware configurations, disconnected peripherals etc, but the symptoms persisted.

To cut a long story short, after sending the computer back to HP under guarantee twice (and on one occasion a new power supply was fitted), the third and final resort was a new C-drive HDD, and that seemed to resolve the issue. I don't pretend to understand the technicalities, but the new HDD sorted the problem; I never got a satisfactory answer from HP exactly what was wrong with the HDD.

I had similar symptoms a couple of years ago with a fairly new Hewlett Packard (with two separate hard discs). The first time it gave any sign of a problem, it also wiped all the data from both HDDs.

The symptoms settled down to irregular shutting down and instant re-starting, at random intervals, not always when the machine got hot. Sometimes it would happen after half an hour, and on other occasions it would work fine for six or eight hours. We tried various software and hardware configurations, disconnected peripherals etc, but the symptoms persisted.

To cut a long story short, after sending the computer back to HP under guarantee twice (and on one occasion a new power supply was fitted), the third and final resort was a new C-drive HDD, and that seemed to resolve the issue. I don't pretend to understand the technicalities, but the new HDD sorted the problem; I never got a satisfactory answer from HP exactly what was wrong with the HDD.

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